1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_UNITS_H 2 #ifndef _LINUX_UNITS_H
3 #define _LINUX_UNITS_H 3 #define _LINUX_UNITS_H
4 4
5 #include <linux/bits.h> 5 #include <linux/bits.h>
6 #include <linux/math.h> 6 #include <linux/math.h>
7 7
8 /* Metric prefixes in accordance with Système 8 /* Metric prefixes in accordance with Système international (d'unités) */
9 #define PETA 1000000000000000ULL 9 #define PETA 1000000000000000ULL
10 #define TERA 1000000000000ULL 10 #define TERA 1000000000000ULL
11 #define GIGA 1000000000UL 11 #define GIGA 1000000000UL
12 #define MEGA 1000000UL 12 #define MEGA 1000000UL
13 #define KILO 1000UL 13 #define KILO 1000UL
14 #define HECTO 100UL 14 #define HECTO 100UL
15 #define DECA 10UL 15 #define DECA 10UL
16 #define DECI 10UL 16 #define DECI 10UL
17 #define CENTI 100UL 17 #define CENTI 100UL
18 #define MILLI 1000UL 18 #define MILLI 1000UL
19 #define MICRO 1000000UL 19 #define MICRO 1000000UL
20 #define NANO 1000000000UL 20 #define NANO 1000000000UL
21 #define PICO 1000000000000ULL 21 #define PICO 1000000000000ULL
22 #define FEMTO 1000000000000000ULL 22 #define FEMTO 1000000000000000ULL
23 23
24 #define NANOHZ_PER_HZ 1000000000UL 24 #define NANOHZ_PER_HZ 1000000000UL
25 #define MICROHZ_PER_HZ 1000000UL 25 #define MICROHZ_PER_HZ 1000000UL
26 #define MILLIHZ_PER_HZ 1000UL 26 #define MILLIHZ_PER_HZ 1000UL
27 <<
28 #define HZ_PER_KHZ 1000UL 27 #define HZ_PER_KHZ 1000UL
29 #define HZ_PER_MHZ 1000000UL <<
30 <<
31 #define KHZ_PER_MHZ 1000UL 28 #define KHZ_PER_MHZ 1000UL
32 #define KHZ_PER_GHZ 1000000UL !! 29 #define HZ_PER_MHZ 1000000UL
33 30
34 #define MILLIWATT_PER_WATT 1000UL 31 #define MILLIWATT_PER_WATT 1000UL
35 #define MICROWATT_PER_MILLIWATT 1000UL 32 #define MICROWATT_PER_MILLIWATT 1000UL
36 #define MICROWATT_PER_WATT 1000000UL 33 #define MICROWATT_PER_WATT 1000000UL
37 34
38 #define BYTES_PER_KBIT (KILO / BITS_P 35 #define BYTES_PER_KBIT (KILO / BITS_PER_BYTE)
39 #define BYTES_PER_MBIT (MEGA / BITS_P 36 #define BYTES_PER_MBIT (MEGA / BITS_PER_BYTE)
40 #define BYTES_PER_GBIT (GIGA / BITS_P 37 #define BYTES_PER_GBIT (GIGA / BITS_PER_BYTE)
41 38
42 #define ABSOLUTE_ZERO_MILLICELSIUS -273150 39 #define ABSOLUTE_ZERO_MILLICELSIUS -273150
43 40
44 static inline long milli_kelvin_to_millicelsiu 41 static inline long milli_kelvin_to_millicelsius(long t)
45 { 42 {
46 return t + ABSOLUTE_ZERO_MILLICELSIUS; 43 return t + ABSOLUTE_ZERO_MILLICELSIUS;
47 } 44 }
48 45
49 static inline long millicelsius_to_milli_kelvi 46 static inline long millicelsius_to_milli_kelvin(long t)
50 { 47 {
51 return t - ABSOLUTE_ZERO_MILLICELSIUS; 48 return t - ABSOLUTE_ZERO_MILLICELSIUS;
52 } 49 }
53 50
54 #define MILLIDEGREE_PER_DEGREE 1000 51 #define MILLIDEGREE_PER_DEGREE 1000
55 #define MILLIDEGREE_PER_DECIDEGREE 100 52 #define MILLIDEGREE_PER_DECIDEGREE 100
56 53
57 static inline long kelvin_to_millicelsius(long 54 static inline long kelvin_to_millicelsius(long t)
58 { 55 {
59 return milli_kelvin_to_millicelsius(t 56 return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DEGREE);
60 } 57 }
61 58
62 static inline long millicelsius_to_kelvin(long 59 static inline long millicelsius_to_kelvin(long t)
63 { 60 {
64 t = millicelsius_to_milli_kelvin(t); 61 t = millicelsius_to_milli_kelvin(t);
65 62
66 return DIV_ROUND_CLOSEST(t, MILLIDEGRE 63 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE);
67 } 64 }
68 65
69 static inline long deci_kelvin_to_celsius(long 66 static inline long deci_kelvin_to_celsius(long t)
70 { 67 {
71 t = milli_kelvin_to_millicelsius(t * M 68 t = milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE);
72 69
73 return DIV_ROUND_CLOSEST(t, MILLIDEGRE 70 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DEGREE);
74 } 71 }
75 72
76 static inline long celsius_to_deci_kelvin(long 73 static inline long celsius_to_deci_kelvin(long t)
77 { 74 {
78 t = millicelsius_to_milli_kelvin(t * M 75 t = millicelsius_to_milli_kelvin(t * MILLIDEGREE_PER_DEGREE);
79 76
80 return DIV_ROUND_CLOSEST(t, MILLIDEGRE 77 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE);
81 } 78 }
82 79
83 /** 80 /**
84 * deci_kelvin_to_millicelsius_with_offset - c 81 * deci_kelvin_to_millicelsius_with_offset - convert Kelvin to Celsius
85 * @t: temperature value in decidegrees Kelvin 82 * @t: temperature value in decidegrees Kelvin
86 * @offset: difference between Kelvin and Cels 83 * @offset: difference between Kelvin and Celsius in millidegrees
87 * 84 *
88 * Return: temperature value in millidegrees C 85 * Return: temperature value in millidegrees Celsius
89 */ 86 */
90 static inline long deci_kelvin_to_millicelsius 87 static inline long deci_kelvin_to_millicelsius_with_offset(long t, long offset)
91 { 88 {
92 return t * MILLIDEGREE_PER_DECIDEGREE 89 return t * MILLIDEGREE_PER_DECIDEGREE - offset;
93 } 90 }
94 91
95 static inline long deci_kelvin_to_millicelsius 92 static inline long deci_kelvin_to_millicelsius(long t)
96 { 93 {
97 return milli_kelvin_to_millicelsius(t 94 return milli_kelvin_to_millicelsius(t * MILLIDEGREE_PER_DECIDEGREE);
98 } 95 }
99 96
100 static inline long millicelsius_to_deci_kelvin 97 static inline long millicelsius_to_deci_kelvin(long t)
101 { 98 {
102 t = millicelsius_to_milli_kelvin(t); 99 t = millicelsius_to_milli_kelvin(t);
103 100
104 return DIV_ROUND_CLOSEST(t, MILLIDEGRE 101 return DIV_ROUND_CLOSEST(t, MILLIDEGREE_PER_DECIDEGREE);
105 } 102 }
106 103
107 static inline long kelvin_to_celsius(long t) 104 static inline long kelvin_to_celsius(long t)
108 { 105 {
109 return t + DIV_ROUND_CLOSEST(ABSOLUTE_ 106 return t + DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS,
110 MILLIDEGR 107 MILLIDEGREE_PER_DEGREE);
111 } 108 }
112 109
113 static inline long celsius_to_kelvin(long t) 110 static inline long celsius_to_kelvin(long t)
114 { 111 {
115 return t - DIV_ROUND_CLOSEST(ABSOLUTE_ 112 return t - DIV_ROUND_CLOSEST(ABSOLUTE_ZERO_MILLICELSIUS,
116 MILLIDEGR 113 MILLIDEGREE_PER_DEGREE);
117 } 114 }
118 115
119 #endif /* _LINUX_UNITS_H */ 116 #endif /* _LINUX_UNITS_H */
120 117
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